JP2015208066A - Method of manufacturing lamination iron core of vehicle driving motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of manufacture.SOLUTION: In a method of manufacturing a lamination iron core 10, a plurality of annular iron core pieces 14 each configured by a plurality of arcuate iron core pieces 12 arranged annularly are laminated while shifting phase in a circumferential direction to manufacture a lamination iron core main body 16. Next, at a plurality of portions (a plurality of welding parts 18) arranged in the circumferential direction at an inner peripheral part or an outer peripheral part of this lamination iron core main body 16, the arcuate iron core pieces 12 phase-shifted in the circumferential direction, of each layer, are welded in the lamination direction. Thereby, because the arcuate iron core pieces 12 of each layer can be integrally coupled, a dedicated facility for simultaneously performing caulking and lamination is not required. As a result, the cost of manufacture can be reduced.

Description

  The present invention relates to a method for manufacturing a laminated core of a vehicle drive motor.

  Patent Document 1 listed below describes a laminated core formed by sequentially caulking and laminating annular core pieces made of a plurality of segment core pieces arranged in a ring.

JP2013-5628A

  In the laminated iron core as described above, dedicated equipment for performing caulking and laminating at the same time is expensive, so there is room for improvement in terms of reducing manufacturing costs.

  The present invention has been made in consideration of the above-described facts, and an object of the present invention is to provide a method for manufacturing a laminated core of a vehicle drive motor that can reduce manufacturing costs.

  According to the first aspect of the present invention, there is provided a method of manufacturing a laminated core of a motor for driving a vehicle. A single plate with a carrier in which a plurality of arc-shaped core pieces are connected by a connecting portion by pressing a strip-shaped magnetic steel sheet. Cutting the arc-shaped core pieces sequentially from the single plate with the carrier to be conveyed, and forming the annular core pieces by arranging the separated arc-shaped core pieces in a ring shape, In the laminating step of manufacturing the laminated core body by laminating the phases in the circumferential direction, and in a plurality of portions arranged in the circumferential direction in the inner peripheral portion or the outer peripheral portion of the laminated core main body, A welding step of welding the arc-shaped core pieces along the stacking direction.

  In the first aspect of the present invention, the laminated iron core of the vehicle drive motor can be manufactured by the pressing process, the laminating process, and the welding process, so that a dedicated facility for simultaneously performing caulking and laminating is not required. As a result, the manufacturing cost can be reduced. Moreover, since the pressing process and the laminating process are separate processes, it is not necessary to match the production speed of one process with the production speed of the other process. Thereby, the productivity of a process with a high production speed can be improved.

  As described above, in the method for manufacturing a laminated core of a vehicle drive motor according to the present invention, the manufacturing cost can be reduced.

It is a perspective view of the laminated iron core of the vehicle drive motor which concerns on embodiment of this invention. It is a disassembled perspective view which shows the partial structure of the same laminated iron core. It is a schematic sectional drawing which shows the cut surface along the F3-F3 line | wire of FIG. It is a front view which shows the lamination | stacking assembly apparatus used for a lamination process, and the structure of the periphery. It is the top view which looked at the inside of the same lamination assembly device from the upper side. It is a perspective view which expands and shows the principal part of the same lamination assembly apparatus. It is a perspective view which shows the laminated core main body laminated | stacked on the alignment jig. It is a perspective view which shows the condition where the laminated iron core main body is welded in the welding process.

  Hereinafter, the manufacturing method of the laminated core of the vehicle drive motor which concerns on embodiment of this invention using FIGS. 1-8 is demonstrated.

(Configuration of laminated core)
First, a laminated iron core 10 (hereinafter simply referred to as “laminated iron core 10”) manufactured by the laminated iron core manufacturing method for a vehicle drive motor according to the present embodiment will be described. The laminated core 10 is a laminated rotor core used on the rotor side of a vehicle drive motor (electric motor), and is a constituent element of a rotor with magnets. As shown in FIG. 1, the laminated core 10 includes a laminated core body 16 formed by laminating a plurality of annular core pieces 14 in which arc-shaped core pieces 12 (divided core pieces) divided into four pieces are arranged in a ring shape. Is formed by being integrated by a plurality of welds 18.

  In each arc-shaped iron core piece 12, the arc angle θ is set to 90 degrees in the present embodiment. A plurality of (here, four) arc-shaped magnet mounting portions 20 (magnetic pole pieces) arranged in the circumferential direction are formed on the outer peripheral portion of each arc-shaped core piece 12. These magnet mounting portions 20 have an arc angle δ of 22.5 degrees, and each magnet mounting portion 20 has a magnet mounting hole 22 for mounting a magnet.

  In addition, a plurality (four in this case) of circular guide holes 24 arranged in the circumferential direction are formed in the intermediate portion in the width direction (intermediate portion between the outer periphery and the inner periphery) of each arc-shaped core piece 12. . These guide holes 24 are used to insert guide pins 68 provided in an alignment jig 62 (see FIGS. 7 and 8) used when the plurality of annular core pieces 14 are laminated and when the laminated core body 16 is welded. Pilot hole.

  The guide hole 24 and the magnet mounting portion 20 are provided so as to be arranged every 22.5 degrees in a state where the circular core pieces 14 are arranged by arranging the circular core pieces 12 in a ring shape. The hole 24 is provided in the same phase as the magnet mounting portion 20 in the circumferential direction of the annular core piece 14.

  As shown in FIG. 2, the annular core pieces 14 that are overlapped with each other are laminated in a so-called brick pile, with the seams 26 between the circumferential arc-shaped core pieces 12 being out of phase in the circumferential direction. In the present embodiment, the phase shift angle is set to 22.5 degrees, which is the same as the arc angle δ of the magnet mounting portion 20.

  When the annular core pieces 14 are stacked with a phase shift of 22.5 degrees, the magnet mounting portion 20 and the guide hole 24 are arranged every 22.5 degrees, and therefore each of the magnet mounting portion 20 and the guide hole 24 is provided. The position of coincides with the stacking direction. Therefore, the magnet mounting part 20 and the guide hole 24 penetrate from the one axial end side of the laminated core body 16 to the other axial end side.

  The plurality of welded portions 18 that integrate the plurality of annular core pieces 14 laminated as described above are provided in the circumferential direction on the inner peripheral portion of the laminated core body 16. In the present embodiment, the plurality of welds 18 are provided in the same number as the number of magnetic poles of the laminated core body 16 (here, 16 poles), and the arc-shaped core pieces 12 of each layer that are out of phase in the circumferential direction are arranged in the lamination direction. Welding (joining) along.

  The plurality of welded portions 18 are located on the opposite side of the magnet mounting portion 20 through the guide holes 24 and are provided at 22.5 degrees on the inner peripheral portion of the laminated core body 16. As shown in FIG. 1, key grooves 28 (not shown in FIG. 3) are formed between the plurality of welds 18, but they are not necessarily formed.

(Method for producing laminated core 10)
Next, a method for manufacturing the laminated core 10 having the above configuration will be described.

  The manufacturing method of the laminated core 10 includes a pressing process that is a first process, a lamination process that is a second process, a welding process that is a third process, and an inspection process that is a fourth process.

  In the pressing step, a single plate 30 with a carrier in which a plurality of arc-shaped iron core pieces 12 are connected by a pair of connecting portions 32 by pressing a strip-shaped magnetic steel plate with a mold device (see FIGS. 4 to 6). Manufacturing. Then, the manufactured single plate 30 with a carrier is wound around a reel 34 (see FIG. 4), and the process proceeds to the next stacking step.

  In the laminating step, the arc-shaped core pieces 12 are sequentially separated from the single plate 30 with the carrier to be conveyed, and the plurality of annular core pieces 14 are formed while arranging the separated arc-shaped core pieces 12 in a ring shape to form the annular core pieces 14. The laminated core body 16 is manufactured by laminating with the phases shifted in the circumferential direction. Specifically, first, the reel 34 is attached to the reel stand 36 shown in FIG. 4, and the single plate 30 with the carrier wound around the reel 34 is unwound so that the laminated assembly apparatus 38 shown in FIG. 4 and FIG. It is wound around the guide roller 40 and inserted into the laminated assembly apparatus 38.

  In the laminating and assembling apparatus 38, a feed feeder 42, a servo press 46, an electric index machine 48, a ROBO cylinder 50, and a control panel 52 for controlling these operations are provided. The feed feeder 42 holds the single plate 30 with the carrier inserted into the stacking assembly apparatus 38 and conveys it to the servo press 46 and the electric index machine 48 side. In addition, the direction shown by the arrow A in FIG.4 and FIG.5 is a conveyance direction of the single plate 30 with a carrier.

  The servo press 46 is provided with a connecting portion cut type punch 54, and the carrier-attached single plate 30 conveyed between the servo press 46 and the connecting portion cut type die 56 disposed on the lower side of the punch 54. The arc-shaped core pieces 12 are sequentially cut off from the connecting portion 32. The connecting portion 32 from which the arc-shaped core piece 12 is cut is discharged out of the laminating and assembling apparatus 38 through the inside of the transport pipe 58 (not shown in FIGS. 4 and 5) shown in FIG. It is conveyed to the cutting machine.

  The separated arc-shaped iron core piece 12 is pushed by the punch 54 onto the alignment jig 62 detachably attached to the rotary table 60 of the electric index machine 48. As shown in FIGS. 6 and 7, the alignment jig 62 includes a ring-shaped lower plate 64 and a plurality of (here, 16) guide pins 68 (pilot pins) protruding upward from the lower plate 64. ) And a plurality (eight in this case) of columns 70 projecting upward from the alignment jig 62. In addition, the number of the guide pins 68 and the support | pillars 70 can be changed suitably.

  The 16 guide pins 68 are arranged at equal intervals (22.5 degrees) in the circumferential direction of the lower plate 64 and are firmly fixed to the lower plate 64. Further, the eight struts 70 are arranged at equal intervals (intervals of 45 degrees) in the circumferential direction of the lower plate 64 on the inner peripheral side of the lower plate 64 relative to the 16 guide pins 68, and are firmly attached to the lower plate 64. It is fixed to. The alignment jig 62 includes the ring-shaped upper plate 72 shown in FIG. 8, but is used in a state where the upper plate 72 is removed in the stacking process.

  The arcuate core pieces 12 pushed onto the alignment jig 62 are held on the alignment jig 62 with the guide pins 68 inserted into the four guide holes 24, respectively. The alignment jig 62 is rotated about the vertical axis by the rotary table 60 of the electric index machine 48 in conjunction with the feed feeder 42 and the servo press 46 and is lowered by the ROBO cylinder 50 at a predetermined timing.

  Specifically, first, each time the one arc-shaped core piece 12 is pushed onto the aligning jig 62 in order to form the annular core piece 14 by arranging the arc-shaped core pieces 12 in an annular shape, the aligning jig 62 is shown in FIG. Is rotated 90 degrees (the arc angle θ of the arc-shaped core piece 12) in the direction of arrow B of 5. By repeating this 90-degree rotation four times, one annular core piece 14 is completed. Next, the alignment jig 62 is lowered by the thickness of the arc-shaped iron core piece 12 by the ROBO cylinder 50 and rotated 22.5 degrees (phase shift angle δ) in the direction of arrow B in FIG. Is done. By sequentially repeating the above processing, the plurality of annular core pieces 14 are laminated (rotated and laminated) with the phases shifted in the circumferential direction, and the laminated core body 16 is manufactured. Then, the manufactured laminated core body 16 is removed from the turntable 60 together with the alignment jig 62, and the process proceeds to the next pressing step.

  In the pressing step, the arc-shaped cores of the respective layers whose phases are shifted in the circumferential direction at a plurality of portions arranged in the circumferential direction in the inner circumferential portion of the laminated core body 16 (here, 16 locations: refer to the welded portions 18 in FIGS. 1 and 3). The pieces 12 are welded along the stacking direction. Specifically, first, as shown in FIG. 8, the upper plate 72 is attached to the alignment jig 62. The upper plate 72 is fixed to the upper ends of the eight columns 70 by, for example, bolt fastening, and holds the laminated core body 16 at a predetermined thickness. Alternatively, for example, the laminated core body 16 is held at a predetermined thickness by a dedicated holding device that holds the upper plate 72 and the lower plate 64 up and down with eight columns 70 interposed therebetween.

  Next, an alignment jig 62 is mounted on a turntable 60 provided in the fiber laser welder shown in FIG. 8, and the above-described welding is performed by the fiber laser welder (note that reference numeral 76 is attached in FIG. 8). The member is a torch of a fiber laser welder). Thereby, the laminated iron core 10 is completed. The completed laminated iron core is subjected to a predetermined inspection in the inspection process of the next process.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  In this embodiment, the laminated core 10 is manufactured by the press process, the lamination process, and the welding process described above. In the laminated core 10, the laminated core body 16 is formed by laminating a plurality of annular core pieces 14 each constituted by a plurality of circular arc-shaped core pieces 12 arranged in a ring with a phase shifted in the circumferential direction. A plurality of welded portions 18 are arranged in the circumferential direction on the inner peripheral portion of the laminated core body 16. In these welds 18, the arc-shaped core pieces 12 of the respective layers that are out of phase in the circumferential direction are welded along the stacking direction. As a result, the arc-shaped core pieces 12 of each layer can be integrally joined, and therefore no dedicated equipment for simultaneously performing caulking and stacking is required. As a result, the manufacturing cost can be reduced.

  That is, since the caulking method is not used, the cost of the mold can be greatly reduced. In addition, since a dedicated press machine for simultaneously performing pressing and rotary lamination is unnecessary, a standard press machine can be used, and the cost of the press machine can be greatly reduced. As a result, even if the laminating and assembling apparatus 38 and welding equipment are included, the equipment can be made much cheaper than the conventional method. In addition, even when the number of laminated cores 10 to be produced increases, it can be dealt with by adding a relatively inexpensive laminated assembly device 38, which is preferable.

  In the present embodiment, the outer peripheral portion of the laminated core body 16 is provided with a plurality of magnet mounting portions 20 provided on the outer peripheral portion of the plurality of arc-shaped core pieces 12, while the inner periphery of the laminated core body 16 is arranged. The part is provided with a plurality of welds 18. Thereby, it can suppress that a welding distortion arises in the magnet mounting part 20 with the heat | fever at the time of welding the welding part 18. FIG.

  Further, in the present embodiment, the arc-shaped iron core piece 12 is formed with the guide hole 24 into which the guide pin 68 provided in the alignment jig 62 used at the time of lamination and welding is inserted. The magnet mounting part 20 and the magnet mounting part 20 are located on the opposite sides of each other through the guide hole 24. Thereby, it can suppress that the heat at the time of welding the welding part 18 is transmitted to the magnet mounting part 20. FIG. In addition, the heat can be transmitted to the alignment jig 62 via the guide pins 68 inserted into the guide holes 24. As a result, it is possible to effectively suppress welding distortion from occurring in the magnet mounting portion 20.

  In the present embodiment, the arc-shaped core pieces 12 of each layer are welded in the stacking direction by the same number of welding portions 18 as the number of magnetic poles of the laminated core body 16 (the number of magnet mounting portions 20 provided in one annular core piece 14). ing. Thereby, the arc-shaped core pieces 12 of each layer can be firmly bonded.

  Moreover, in this embodiment, since the press process and the lamination process are separate processes, it is not necessary to match the production speed of one process with the production speed of the other process. Thereby, the productivity of a process with a high production speed can be improved.

(Supplementary explanation of the embodiment)
In the said embodiment, although the laminated core main body 16 was set as the structure made into 16 poles, this invention is not limited to this, The number of the magnetic poles of the laminated core main body 16 can be changed suitably.

  Moreover, in the said embodiment, although it was set as the structure provided with the same number of the welding parts 18 as the magnetic pole number of the laminated core main body 16, this invention is not restricted to this, The number of welding parts can be changed suitably. For example, a configuration may be employed in which half the number of magnetic poles of the laminated core body is provided.

  Moreover, in the said embodiment, although it was set as the structure by which the welding part 18 and the magnet mounting part 20 were provided in the mutually opposite side via the guide hole 24, this invention is not limited to this, A welding part and a guide hole are provided. You may make it the structure provided by shifting | deviating in the circumferential direction of an arc-shaped iron core piece.

  Moreover, in the said embodiment, although it was set as the structure by which the welding part 18 was provided in the inner peripheral part of the laminated core main body 16, this invention is not restricted to this, The structure by which the welded part was provided in the outer peripheral part of the laminated core main body It may be.

  In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 10 Laminated iron core of vehicle drive motor 12 Arc-shaped iron core piece 14 Annular iron core piece 16 Laminated iron core body 18 Welding part 30 Single plate with carrier 32 Connecting part

Claims (1)

A press process for manufacturing a single plate with a carrier in which a plurality of arc-shaped iron core pieces are connected by a connecting portion by pressing a strip-shaped magnetic steel sheet;
The arc-shaped core pieces are sequentially cut off from the single plate with the carrier to be conveyed, and the plurality of the ring-shaped core pieces are arranged in a circumferential direction while arranging the cut-off arc-shaped core pieces in a ring shape. A lamination process for producing a laminated core body by laminating and laminating;
A welding step of welding the arc-shaped core pieces of the respective layers out of phase in the circumferential direction along the lamination direction in a plurality of portions arranged in the circumferential direction in the inner circumferential portion or the outer circumferential portion of the laminated core body;
A method for manufacturing a laminated iron core of a vehicle drive motor comprising:

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